JP5101254B2 - Method for producing reinforcing fiber assembly - Google Patents

Description

The present invention relates to a method for producing a reinforcing fiber assembly thereof according to the set product machine.

  A composite material obtained by impregnating a reinforcing fiber with a matrix resin (hereinafter simply referred to as a reinforcing fiber material) is light in weight, excellent in mechanical strength and processability, and tends to be used in various fields.

  The reinforcing fiber material is processed into a flat yarn or a spread yarn, and is used in the form of, for example, a woven fabric, a knitted fabric, or a braid.

  Assemblies using reinforced fiber materials are used, for example, for golf shafts, fishing rods, tennis and badminton rackets, hockey sticks, and the like, and are continuously assembled using a braiding machine called a braider. The braider is provided with a plurality of bobbins around which a fiber bundle is wound around a mandrel outer periphery having a circular or square cross section, and the fiber bundle is sent out while moving the bobbin to perform assembling (for example, Patent Document 1).

  FIG. 5 is a schematic diagram showing a conventional assembling method. In the conventional assembling method using a braider, the center axis of the bobbin bobbin D is installed in parallel to the composition direction perpendicular to the paper surface. When assembling while moving the installed bobbin, the bobbin However, there is a problem that when the flat yarn or the spread yarn is used while moving along the figure eight orbit, the yarn collected in the central portion as the composition position is easily twisted.

  When assembled in a state where the yarn is twisted, the surface smoothness of the braid is deteriorated. In order to satisfy the surface smoothness, the surface of the braid can be polished, but the reinforcing fibers are cut by the polishing, and the mechanical strength is lowered.

JP 2005-219285 A

An object of the present invention is to provide a method for producing a reinforcing fiber set product excellent in surface smoothness without causing twist.

In the present invention, a plurality of bobbins around which reinforcing fibers are wound are moved on a substantially circumferential track, and the unwound reinforcing fibers are formed in a predetermined composition direction at the center of the circumferential track. A method of manufacturing a reinforcing fiber assembly by manufacturing reinforcing fiber assemblies by assembling reinforcing fibers,
A method for manufacturing a reinforcing fiber assembly, wherein the bobbin is assembled by moving the bobbin on a track so that a central axis of the bobbin is perpendicular to the composition direction.

  Further, the present invention provides the bobbin such that a central axis of the bobbin is perpendicular to the composition direction and a central axis of the bobbin is perpendicular to a radial direction of the substantially circumferential track. It is characterized in that the assembling is carried out by moving the orbit.

  Further, the present invention is characterized in that the bobbin is moved and moved on the track so that the bobbin itself rotates once while the bobbin makes a round of the track.

  In the invention, it is preferable that the reinforcing fiber is a flat yarn or a spread yarn obtained by impregnating the reinforcing fiber with a resin.

  According to the present invention, a plurality of bobbins around which reinforcing fibers have been wound are moved on a substantially circumferential track, and the unwound reinforcing fibers are moved in a predetermined composition direction at the center of the circumferential track. It is a manufacturing method of the reinforcing fiber assembly which manufactures a reinforcing fiber assembly by assembling reinforcing fibers by composition.

  At this time, the bobbin is moved on the track so that the center axis of the bobbin is perpendicular to the composition direction.

  Thereby, the twist which generate | occur | produces during manufacture is eliminated, and the outstanding surface smoothness of the obtained reinforced fiber assembly and the improvement of mechanical strength are implement | achieved.

  According to the present invention, the bobbin has a central axis perpendicular to the composition direction, and the bobbin central axis is perpendicular to the radial direction of the substantially circumferential orbit. The bobbin is moved on the track and assembled.

  Thereby, the twist which generate | occur | produces in assembling more reliably is eliminated, and the outstanding surface smoothness of the obtained reinforcing fiber assembly and the improvement of mechanical strength are implement | achieved.

  Further, according to the present invention, the bobbin is moved and assembled on the track so that the bobbin itself rotates once while the bobbin makes a round of the track.

  Thereby, the twist which generate | occur | produces in assembling more reliably is eliminated, and the outstanding surface smoothness of the obtained reinforcing fiber assembly and the improvement of mechanical strength are implement | achieved.

  According to the invention, the reinforcing fiber can be a flat yarn or a spread yarn obtained by impregnating a resin into a reinforcing fiber.

  Hereinafter, the present invention will be described more specifically with reference to embodiments. FIG. 1 is an external view showing a configuration of a braider 1 using the assembling method of the present invention.

  The braider 1 includes a braider body 2 and a mandrel device 3. The braider body 2 includes a curved upper plate 5 having a predetermined radius of curvature R, which is disposed in a substantially cylindrical machine base 4 having a horizontal axis and having an opening on one side, and a track formed in the upper plate 5. The bobbin carrier 6 travels along the track, the driving device 7 for traveling the bobbin carrier 6 along the track, the composition position stabilization guide member 8 and the like.

  As shown in the cross-sectional view of FIG. 2, the curved upper plate 5 is a suitable fixing member with a predetermined interval between a substantially cylindrical machine frame disposed in the substantially cylindrical machine base 4. A known track is formed in the upper plate 5 in the circumferential direction.

  A flat yarn or an open yarn (hereinafter, sometimes simply referred to as an open yarn) is unwound from a bobbin placed on the bobbin carrier 6 and reaches a composition point on the mandrel supported by the mandrel device 3. It is a thread to go.

  The engaging shaft of the bobbin carrier 6 is moved by appropriate driving means such as a motor so that the bobbin carrier 6 travels along the track. As described above, the bobbin carrier 6 is run along the track formed in the curved upper plate 5 so that a large number of spread yarns are interlaced to form a braid on the mandrel. Correspondingly, the braided string is entangled with the spread yarn from the bobbin carrier 6 arranged substantially horizontally on the side wall of the machine base 4 and unfolded from the bobbin carrier 6 traveling along the track. Composition.

  The flat yarn and spread yarn used in the present invention are those obtained by impregnating a reinforcing resin with a matrix resin.

  For the types of reinforcing fibers, high-strength and high-elasticity fibers, such as carbon fiber, aramid fiber, PBO fiber, polyarylate fiber, high-strength polyethylene fiber, alumina fiber, silicon carbide fiber, Tyranno fiber, stainless steel fiber, glass fiber, etc. Flat strands or open yarns of strands in which long fibers are bundled are suitable. As the fineness, a single fineness of 0.01 tex to 10 tex is suitable, and any flatness or open yarn can be used. A preferable range of the yarn width is 1 mm to 60 mm. More preferably, the width of 2 mm to 20 mm is suitable for the stable surface of the spread yarn.

  The matrix resin is preferably a solid at normal temperature, and examples thereof include an epoxy resin, a phenol resin, and a vinyl ester resin.

  Since the reinforcing fibers are temporarily fixed with resin, the yarn width does not converge at all during assembling, which is suitable for flat yarns or spread yarns.

  In particular, the carbon fiber spread yarn is particularly preferable because the impregnation property of the matrix resin is improved, the resin-rich portion or void is eliminated in the reinforcing fiber material, and the mechanical strength characteristics are improved.

  It is not difficult to imagine that it is preferable to use flat yarn and spread yarn for the braid, but when the conventional manufacturing method is applied as it is, the spread yarn unwound from the bobbin is Twisting occurs before reaching a certain mandrel, resulting in poor surface smoothness and mechanical strength.

  On the other hand, the production method of the present invention as described below eliminates the occurrence of twists and realizes excellent surface smoothness and improved mechanical strength.

FIG. 3 is a schematic view showing a method for producing a reinforcing fiber assembly according to the first embodiment of the present invention.
The schematic diagram is a view of the braider 1 as viewed from the front, the composition portion C is located at the center of the circle, and the composition direction is a direction perpendicular to the paper surface.

  The bobbin A is indicated by a shape “D” in the schematic diagram, and two closed curves L1 and L2 drawn by solid lines indicate the trajectory of the bobbin D.

  The spindle holding the bobbin D moves continuously on two circumferential tracks L1 and L2 arranged in a circumferential shape while half are passing clockwise and the other half are counterclockwise. A slanted fiber and a longitudinal fiber constitute a braid, and a slanted fiber (braid) and a longitudinal fiber (center thread) can be set as appropriate. The braid is oriented at an angle of ± θ with respect to the longitudinal direction, and this braid angle is controlled by the moving speed of the spindle and the pulling speed of the braid, and can be freely changed to 0 ° <θ <90 °. Can do.

  When composing a spread yarn, it is necessary to first pull the bobbin D from the yarn outlet to the center (base) so that the yarn is not twisted and the yarn is not crushed.

  In the case of composing the opened yarn, it is preferable for the braiding machine that the bobbin D is arranged so that the center axis of the bobbin winding is perpendicular to the composition direction, and the bobbin D is arranged in this way. The yarn is twisted by moving it.

  Furthermore, a braid with higher surface smoothness can be realized by preventing the convergence of the yarn width caused by the rubbing of the yarns at the base.

  The bobbin D is normally urged with a back tension by a spring force, but the stronger the back tension, the stronger the friction of the yarn at the base. On the other hand, if the composition is performed without urging the back tension, the yarn is not wound along the mandrel which is the core material, so that it does not hold as a braid. Therefore, by applying an appropriate back tension to the bobbin D, it becomes possible to prevent the yarns from rubbing at the base part. The back tension (tension) to be urged is preferably 0.1 kg to 0.5 kg, and it was confirmed that the yarn width does not converge at 0.3 kg.

  Furthermore, since the yarn width converges between the base and the mandrel, it is possible to realize a braid with higher surface smoothness by preventing this.

  By making the distance from the base part to the mandrel as the core material as small as possible, it is possible to prevent the yarn width from converging. Specifically, by bringing the opening diameter of the base part close to the outer diameter of the mandrel that is the core material, the friction between the threads is reduced, and the occurrence of convergence of the thread width at the base part can be prevented. In order to reduce the distance from the base part to the mandrel as the core material, it is preferable to perform the composition as close to the base part as possible, that is, in the same plane including the opening inside the opening.

FIG. 4 is a schematic view showing a method for producing a reinforcing fiber assembly according to the second embodiment of the present invention.
It differs from the first embodiment shown in FIG. 3 only in the operation of the bobbin D, and the other configurations are the same.

  In the first embodiment, at the position where the position of the bobbin D hits the antinode of the track, such as 0 °, 45 °, 90 °, the central axis of the bobbin D is perpendicular to the composition direction and the radius of the circumferential track It is also perpendicular to the direction. However, when the bobbin D comes to the position of the orbital nodes such as A and B, the central axis of the bobbin D is perpendicular to the composition direction but perpendicular to the radial direction of the circumferential orbit. Not. In such positions A and B, the spread yarn may be pulled in an unreasonable direction and twist may occur.

  Thus, in the second embodiment, the center axis of the bobbin D is moved so as to be perpendicular to the composition direction and always perpendicular to the radial direction of the circumferential orbit. As a result, the opened yarn is not pulled out in an unreasonable direction, and the occurrence of twist due to warping of the yarn can be reliably prevented.

  One bobbin D makes one revolution (360 ° revolution) and the bobbin itself makes one revolution (360 ° rotation) before returning to the same position. For example, at the 0 ° position, the central axis direction of the bobbin D indicates the 90 ° direction, and at the 45 ° position, the bobbin itself indicates the 45 ° inclination and the 135 ° direction. Further, at the 90 ° position, the bobbin itself also has a 90 ° inclination and points in the 0 ° direction, and the central axis of the bobbin is always perpendicular to the radial direction of the circumferential orbit at each position. By doing so, it is possible to pull out the yarn so that the yarn is not twisted between the bobbin and the base portion, and the yarn is not crushed.

  The convergence of the yarn width from the base part to the mandrel is preferably the same as that of the first embodiment.

The reinforcing fiber assembly obtained by the production method as described above is excellent in surface smoothness and mechanical strength is also improved. Here, the mechanical strength is enhanced by a set comprises, tensile strength, flexural strength, compressive strength.

  Further, the flat yarn and the spread yarn constituting the reinforcing fiber assembly preferably have an aspect ratio of 30 or more, which is a ratio of the yarn width to the yarn thickness (yarn width / yarn thickness). By using such an aspect ratio, the crimp angle becomes small and excellent surface smoothness can be obtained.

  Further, the width of the flat yarn and the spread yarn is preferably 1 mm to 60 mm, and the thickness of the yarn is preferably 1 μm to 60 μm.

  When using a carbon fiber spread yarn, for example, a 24K (24,000 filaments) carbon fiber yarn is opened to a width of 24 mm, and the resulting spread yarn is cut to a width of 3 mm in the fiber direction to correspond to 3K. Open yarn (fineness 200 tex) is obtained. This is impregnated with an epoxy resin as a matrix resin to obtain a spread yarn as a reinforcing fiber material.

  The obtained spread yarn is assembled using the method for producing a reinforcing fiber assembly as described above, and a reinforcing fiber assembly having excellent surface smoothness and improved mechanical strength can be obtained.

  By using the spread yarn having such an aspect ratio, the crimp angle in the reinforcing fiber assembly can be sufficiently reduced, and excellent surface smoothness can be realized.

  As an example, a 24K carbon fiber yarn was opened, impregnated with an epoxy resin, and 2 mm width (12 divisions) or 3 mm width (8 divisions) was used as a reinforcing fiber material.

The obtained spread yarn was assembled according to the second embodiment to obtain a reinforced fiber assembly.
In the examples, as 24K carbon fiber yarn, Toho Tenax Co., Ltd., IM60024K yarn, Toho Tenax Co., Ltd., STS24K yarn was used.

  As a comparative example, assembling was performed using an unopened carbon fiber yarn impregnated with an epoxy resin.

In a comparative example, as carbon fiber yarn, Toho Tenax Co., Ltd., IM60024K yarn,
Toho Tenax Co., Ltd., STS24K yarn, Toho Tenax Co., Ltd., HTAW 0.5K yarn was used.

  Opening the IM60024K raw yarn to 24 mm, opening the obtained open yarn to a width of 3 mm, Example 2 and opening the STS24K raw yarn to 32 mm An opened yarn cut to a width of 2 mm is referred to as Example 3.

  Comparison using IM60024K yarn without opening, Comparative Example 1, Comparison using STS24K yarn without opening, Comparison Example 2, Comparison using HTAW0.5K yarn without opening Example 3 is assumed.

  The aspect ratio of each example and comparative example was calculated as an average value of the yarn width and yarn thickness measured at 20 cross sections.

  The aspect ratio of Example 1 was 128, the aspect ratio of Example 2 was 80, and the aspect ratio of Example 3 was 54.

  In any case, the aspect ratio was 30 or more, and the obtained reinforcing fiber assembly was excellent in surface smoothness and exhibited high mechanical strength.

  In contrast, the aspect ratio of Comparative Example 1 was 16.6, the aspect ratio of Comparative Example 2 was 10.4, and the aspect ratio of Comparative Example 3 was 26.1.

  In any case, the aspect ratio was smaller than 30, and the obtained reinforcing fiber assembly was inferior to the examples in both surface smoothness and mechanical strength.

Specific strength measurement results are shown below.
(Tensile strength measurement)
The tensile strength was measured under the following conditions.
The assembly angle and the yarn width were matched, and the opening assembly was laminated by a multiple of the aspect ratio (width / thickness) of the opening yarn and the raw yarn, and the yarn amount was adjusted.

The mandrel of the assembly machine is the same, and the number of bobbin settings is also the same.
Opening yarn assembly: Eight layers of the opening yarn of Example 1 were laminated with a mandrel diameter of 20 mm, an assembly angle of 60 °, and 24 bobbins (one assembly).

  Raw yarn assembly: One layer of Comparative Example 1 was prepared with a mandrel diameter of 20 mm, an assembly angle of 60 °, and 24 bobbins (one assembly).

Sample size for measurement: flat plate width 32 mm × length 250 mm × thickness 2 mm (opened yarn and raw yarn each n = 3, total 6), tab was aluminum 32 mm × 50 mm, and resin was molded from unsaturated polyester.
Sample 2K60-2 (opened braid 60 ° 8 layers) Sample 5N60-2 (raw yarn braid 60 ° 1 layers)
Sample 3K60-3 (open fiber assembly 60 ° 8 layers) Sample 6N60-3 (raw yarn assembly 60 ° 1 layer)

The measuring machine was INSTRON 4206, load cell capacity 10t, manufactured by Instron, and the span was measured at 150 mm.
The results are shown in Table 1.

  As for the tensile strength, the opened yarn assembly showed a higher value than the original yarn assembly. Regarding the tensile elastic modulus, the spread yarn assembly showed a low value. From the results, the raw yarn assembly breaks at a stretch, but the opened yarn assembly has a characteristic that it stretches and gradually breaks. The cause of the difference in tensile strength is that in the opened yarn assembly, the filament tension of each carbon fiber is aligned by opening, and the crimp angle is small. It has an effect.

(Bending strength measurement)
The bending strength was measured under the following conditions.
The assembly angle and the yarn width were matched, and the opening assembly was laminated by a multiple of the aspect ratio (width / thickness) of the opening yarn and the raw yarn, and the yarn amount was adjusted.

The mandrel of the assembly machine is the same, and the number of bobbin settings is also the same.
Opening yarn assembly: Eight layers of the opening yarn of Example 1 were laminated with a mandrel diameter of 20 mm, an assembly angle of 60 °, and 24 bobbins (one assembly).

  Raw yarn assembly: One layer of Comparative Example 1 was prepared with a mandrel diameter of 20 mm, an assembly angle of 60 °, and 24 bobbins (one assembly).

Sample size for measurement: flat plate width 32 mm × length 75 mm × thickness 2 mm (opened yarn, raw yarn n = 2, total 4), the resin was molded from unsaturated polyester.
Sample 1K60-1b (opening braid 60 ° 8 layers) Sample 3N6 0-1b (raw yarn braid 60 ° 1 layers)
Sample 2K60-2b (opening braid 60 ° 8 layers) Sample 4N60-2b (raw yarn braid 60 ° 1 layers)

The measuring machine was made by Shimadzu Corporation, Autograph AG-500E, load cell 5 kN, span span was 40 mm, test speed was 1 mm / min, and a three-point bending test was performed.
The results are shown in Table 2.

Differences in bending strength and flexural modulus were clearly shown, and the significance of the spread yarn assembly became clear. As a cause of the difference in tensile strength, it can be seen from this result that, in the opened yarn assembly, the filament tension of each carbon fiber is aligned by opening the fibers, and the straightness of the fibers is obtained, and the crimp angle is small. Therefore, the fact that the straightness of the fiber bundle is obtained is affected.
As described above, by using the spread yarn, it was possible to suppress the occurrence of buckling of the fibers in the braid and obtain a braid excellent in compression characteristics and the like.

It is an external view which shows the structure of the braider 1 using the assembling method of this invention. It is sectional drawing of the braider 1. FIG. It is a schematic diagram which shows the manufacturing method of the reinforced fiber assembly which is the 1st Embodiment of this invention. It is a schematic diagram which shows the manufacturing method of the reinforced fiber assembly which is the 1st Embodiment of this invention. It is a schematic diagram which shows the conventional assembling method.

Explanation of symbols

1 Braider 2 Braider body 3 Mandrel device 4 Machine stand
5 Upper plate 6 Bobbin carrier 7 Drive device 8 Composition position stabilization guide member

Claims (4)

A plurality of bobbins on which reinforcing fibers are wound in advance are moved on a substantially circumferential track, and the reinforced fibers are formed in a predetermined composition direction at the center of the circumferential track in the predetermined composition direction. Is a method for manufacturing a reinforcing fiber assembly by manufacturing a reinforcing fiber assembly,
A method for manufacturing a reinforcing fiber assembly, wherein the bobbin is assembled by moving the bobbin on a track so that a central axis of the bobbin is perpendicular to the composition direction.   The bobbin is moved on the track so that the center axis of the bobbin is perpendicular to the composition direction and the center axis of the bobbin is perpendicular to the radial direction of the substantially circumferential track. The method for producing a reinforcing fiber assembly according to claim 1, wherein the assembling is performed.   2. The method of manufacturing a reinforcing fiber assembly according to claim 1, wherein the bobbin is moved and moved on the track so that the bobbin itself makes one rotation while the bobbin makes a round of the track.   The method for producing a reinforcing fiber assembly according to any one of claims 1 to 3, wherein the reinforcing fiber is a flat yarn or a spread yarn in which a reinforcing fiber is impregnated with a resin.

Images